Interactions of the χc1(4274)\chi_{c1}(4274) state with light mesons

We investigate the interactions of the $\chi_{c1}(4274)$ state with light mesons in the hot hadron gas formed in heavy ion collisions. The vacuum and thermally-averaged cross sections of production of $\chi_{c1}(4274)$ accompanied by light pseudoscalar and light vector mesons as well as the corresponding inverse processes are estimated within the context of an effective Lagrangian approach. The results suggest non-negligible thermal cross-sections, with larger magnitudes for most of the suppression reactions than those for production. This might be a relevant feature to be considered in the analysis of future data collected in heavy ion collisions.Comment: 9 pages, 6 figure

Sustainable water services and interaction with water resources in Europe and in Brazil

International audienceThe increasing interaction between large cities and nature makes "urban water" an issue: water resources and water services - including public water supply, sewage collection and treatment, and in large cities, storm water control -, which had become separate issues thanks to the process of water transport and treatment technologies, are now increasingly interfering with each other. We cannot take nature for granted anymore, and we need to protect water resources, if only to reduce the long term cost of transporting and treating water. In this paper, we compare the historical development of water industry technologies in European and Brazilian metropolitan areas, in their socio-economic and political context, tracing it through three "ages" of water technology and services which developed under civil engineering, sanitary engineering, and environmental engineering perspectives: the "quantity of water" and civil engineering paradigm was developed on the assumption that water should be drawn from natural environments far from the cities; in the "water quality" and chemical/sanitation engineering paradigm, water treatment was invented and allowed cities to take water from rivers closer to them and treat it, but also to reduce sewer discharge impacts; finally, the environmental engineering paradigm proposes to overcome the supply side perspective, by introducing demand side management, water conservation, water allocation flexibilisation, and an integrated approach to water services, water resources management, and land use policies

O uso de biopolímeros como revestimentos comestíveis protetores para conservação de frutas in natura e minimamente processadas.

bitstream/CNPDIA-2010/12624/1/BPD29-2009.pd

One-loop divergences in the two-dimensional non-anticommutative supersymmetric sigma-model

We discuss the structure of the non-anticommutative N=2 non-linear sigma-model in two dimensions, constructing differential operators which implement the deformed supersymmetry generators and using them to reproduce the classical action. We then compute the one-loop quantum corrections and express them in a more compact form using the differential operators.Comment: 20pp, 8 figures, uses LaTeX. Title expanded to clarify conten

Elaboração e análise de curva de eluição de Na123I para utilização na síntese da 123I-metaiodobenzilguanidina

Uma curva de eluição de 123 Na foi elaborada para determinar o mínimo volume de eluição que contém a maior concentração radioativa deste radioisótopo. A concentração radioativa de 123I deve ser a mais alta possível afim de evitar perdas de 123I na marcação da 123I-metaiodobenzilguanidina, 123I-MIBG, durante a etapa de aquecimento